i believe it might still make some limited sense for normal sendmsg() and higher MTUs (or 8k NFS) - we could copy & checksum stuff into the ->tcp_page if SG is possible and thus the SG capability improves the VM. (because we can allocate at PAGE_SIZE granularity.)

Basically what your advocating for is to take advantage of SG-onlydevices when we have full control of the page contents.

Sure this would work.

But honestly the real gain from SG-only devices would be (as you know)the memory usage savings when sending a single static file object toseveral thousand clients.

Later,David S. Millerdavem@redhat.com-To unsubscribe from this list: send the line "unsubscribe linux-kernel" inthe body of a message to majordomo@vger.kernel.orgPlease read the FAQ at http://www.tux.org/lkml/